Welcome to the community @malykhs
Great question.
You could Include the sales link/content on your subscription confirmation page for that list.
A contact will therefore only see that sales link after they have submitted their email on your form, clicked the optin link in your confirmation email, then confirmed their subscription.
If you don’t want to show the sales link to all your contacts irrespective of which list they are subscribing to, edit the ‘Email Confirmation’ only for the list associated with your form and not the global Email Confirmation page.
Go to your list and select ‘subscribe & preference pages’ then ‘Email Confirmation’. You can add your sales link/content to the success page so they only see that once they’ve confirmed their optin.
Hope that helps
Andy
Good question @malykhs ,
Another option in addition to what @bluesnapper said would be to create a welcome flow with a survey/questionnaire in it. This could direct people to a typeform survey or another survey platform to ask more detailed questions. The email can say something along the lines of “Thank you for signing up, now fill out this survey so we can get to know you better”.
The benefit of TypeForm is that it integrates with Klaviyo and the responses could sync back to their profiles.